Why was Booth admitted into the presidential box?

[LincolnToddFan]

Eva, of all the conspirators who were executed I always felt sorriest for Atzerodt. Then I read Ed Steer's "Blood on The Moon". The man could have stopped the whole tragedy in it's tracks by going to the Metropolitan Police and making a desperate, urgent confession. If that had failed, he could have gone to Ford's and personally tried to stop it. Even though he was implicated deeply into Booth's spider web at that point, if he'd had a hand in saving the life(or trying to save the life) of the president he would have saved his own neck for sure.

Not only did he not do this, he went around boasting about his part in the plot while he was on the run!

Not a very smart thing to do, to put it mildly.